With summer unofficially officially over, it's time to focus on the important things: Fall movies and potential break-out stars! Last year at this time, Ryan Gosling was just that ridiculously handsome guy from "The Notebook" and "Crazy, Stupid Love." After performances in the fall releases "Drive" and "Ides Of March," however, he became one of the most talked about actors in Hollywood. Michael Fassbender and Jessica Chastain followed similar paths, as did veteran performers like Sandra Bullock and Matthew Lillard (yes, that Matthew Lillard).

So! Which actors and actresses will become the new Goslings and Chastains this fall? Ahead, HuffPost Entertainment looks at ten stars with something to prove over the next four months.

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  • Rebel Wilson

    Wilson -- who had a memorable supporting part in "Bridesmaids" -- has already appeared in the 2012 release "What to Expect When You're Expecting." This fall, however, she's set to star in "Bachelorette," "Pitch Perfect" and "Struck by LIghtning," <em>and</em> she's working on her own television pilot. <strong>The Big Question</strong>: Is Wilson just a gimmick performer or the next Kristen Wiig?

  • Olivia Thirlby

    Since "Juno," Thirlby has done a lot of supporting work in indies like "The Wackness," "Margaret" and "Being Flynn." This fall she hits the studio circuit with "Dredd" and gets a leading role in the indie "Nobody Walks," a drama co-written by Lena Dunham. <strong>The Big Question</strong>: Can Thirlby's 2012 mimic the 2011's of Elizabeth Olsen and Felicity Jones?

  • Joaquin Phoenix

    He's back. For the first time since the ill-fated faux-documentary "I'm Still Here," Joaquin Phoenix returns to theaters in Paul Thomas Anderson's "The Master." <strong>The Big Question</strong>: Has Hollywood forgiven Phoenix, a two-time Oscar nominee, for the "I'm Still Here" hoax enough to reward him with an Academy Award?

  • Ezra Miller

    Miller, who has given strong performances in indies like "We Need to Talk About Kevin" in recent years, steals the coming-of-age film "Perks of Being a Wallflower" with a vigor that recalls a young Johnny Depp. <strong>The Big Question</strong>: Is Miller the next Johnny Depp?

  • Kyle Chandler

    Chandler, who won an Emmy for his outstanding work on "Friday Night Lights," co-stars in the political dramas "Argo" and "Zero Dark Thirty." <strong>The Big Question</strong>: Can Coach Taylor become the go-to supporting actor of his generation, or does that title still belong to Bryan Cranston?

  • Victoria Justice

    Justice, best known for appearing on the Nickelodeon shows "Victorious" and "Zoey 101," stars in Josh Schwartz's directorial debut, "Fun Size." <strong>The Big Question</strong>: Can Schwartz turn Justice into the next Leighton Meester or just the next Mischa Barton?

  • Mackenzie Foy

    Eleven-year-old Mackenzie Foy plays Renesmee, Bella and Edward's vampire baby, in "The Twilight Saga: Breaking Dawn Part 2." <strong>The Big Question</strong>: Can Foy make audiences forget that her onscreen parents had one of the most public break-ups of the last decade?

  • Kristen Stewart

    Don't laugh: With the racy adaptation of "On the Road," Stewart gets the chance to break away from Bella Swan once and for all. <strong>The Big Question</strong>: Will audiences be able to separate Stewart from her tabloid headlines?

  • Chris Tucker

    Chris Tucker makes his first onscreen appearance since 2007's "Rush Hour 3" in "Silver Linings Playbook." <strong>The Big Question</strong>: Is the reluctant A-lister ready to become a star again?

  • Samantha Barks

    Barks reportedly beat out Taylor Swift, Lea Michele and Scarlett Johansson for the role of Eponine in Tom Hooper's adaptation of "Les Miserables." <strong>The Big Question</strong>: She beat Swift, Michele and Johansson: Can Barks live up to the hype?